4DM8

Crystal structure of RARb LBD in complex with 9cis retinoic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for a molecular allosteric control mechanism of cofactor binding to nuclear receptors.

Osz, J.Brelivet, Y.Peluso-Iltis, C.Cura, V.Eiler, S.Ruff, M.Bourguet, W.Rochel, N.Moras, D.

(2012) Proc.Natl.Acad.Sci.USA 109: E588-E594

  • DOI: 10.1073/pnas.1118192109
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Transcription regulation by steroid hormones, vitamin derivatives, and metabolites is mediated by nuclear receptors (NRs), which play an important role in ligand-dependent gene expression and human health. NRs function as homodimers or heterodimers a ...

    Transcription regulation by steroid hormones, vitamin derivatives, and metabolites is mediated by nuclear receptors (NRs), which play an important role in ligand-dependent gene expression and human health. NRs function as homodimers or heterodimers and are involved in a combinatorial, coordinated and sequentially orchestrated exchange between coregulators (corepressors, coactivators). The architecture of DNA-bound functional dimers positions the coregulators proteins. We previously demonstrated that retinoic acid (RAR-RXR) and vitamin D3 receptors (VDR-RXR) heterodimers recruit only one coactivator molecule asymmetrically without steric hindrance for the binding of a second cofactor. We now address the problem of homodimers for which the presence of two identical targets enhances the functional importance of the mode of binding. Using structural and biophysical methods and RAR as a model, we could dissect the molecular mechanism of coactivator recruitment to homodimers. Our study reveals an allosteric mechanism whereby binding of a coactivator promotes formation of nonsymmetrical RAR homodimers with a 21 stoichiometry. Ligand conformation and the cofactor binding site of the unbound receptor are affected through the dimer interface. A similar control mechanism is observed with estrogen receptor (ER) thus validating the negative cooperativity model for an established functional homodimer. Correlation with published data on other NRs confirms the general character of this regulatory pathway.


    Organizational Affiliation

    Institut National de Santé et de Recherche Médicale U964/Centre National de Recherche Scientifique, Unité Mixte de Recherche 7104/Université de Strasbourg, 67404 Illkirch, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Retinoic acid receptor beta
A, B
267Homo sapiensMutation(s): 0 
Gene Names: RARB (HAP, NR1B2)
Find proteins for P10826 (Homo sapiens)
Go to Gene View: RARB
Go to UniProtKB:  P10826
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nuclear receptor coactivator 1
C, D
25Homo sapiensMutation(s): 0 
Gene Names: NCOA1 (BHLHE74, SRC1)
EC: 2.3.1.48
Find proteins for Q15788 (Homo sapiens)
Go to Gene View: NCOA1
Go to UniProtKB:  Q15788
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
REA
Query on REA

Download SDF File 
Download CCD File 
A, B
RETINOIC ACID
C20 H28 O2
SHGAZHPCJJPHSC-YCNIQYBTSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
REAIC50: >1000 nM (88) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.224 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 58.482α = 90.00
b = 83.622β = 90.00
c = 108.779γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
ADSCdata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2012-05-16
    Type: Database references
  • Version 1.2: 2016-11-16
    Type: Non-polymer description